Diffraction gratings are often characterized by their slit density (usually in slits/mm) rather than the separation between each slit. Consider a diffraction grating which advertises a density of 450 slits/mm. What is the separation between each slit? Od 1.73 x 10-4 m = Od 1.73 x 10-5 m Od = 2.22 x 10-6 m =

The distance between two slits is 1.50 × 10 -5 m. A beam of coherent light of wavelength 600 nm illuminates these slits, and the distance between the slit and the screen is 2.00 m. What is the distance on the screen between the central bright fringe and the fourth-order bright fringe? 0.201 m 0.324 m 0.132 m 0.528 m 0.688 m

A 1.0-cm-wide diffraction grating has 1000 slits. It is illuminated by light of wavelength 550 nm. What are the angles of the first two diffraction orders?

A laser light source with wavelength λ = 545 nm is incident on a diffraction grating (as in the figure). The grating has 495 slits per mm. An observation screen is a distance L = 0.35 m from the grating. What is the separation between individual slits in the grating? Be careful with units: 1 nm = 10-9 m, 1 mm = 10-3 m, and 1 cm = 10-2 m. d = nm What is the distance y along the screen where the first-order diffraction peak is observed? y= cm source grating m=1